What are the advantages of having perforated walls among the vessel elements?

just here for the other one bc they put up with u

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

not sure if this is what you'r looking for eubacteria and archaebacteria